Ophiomyia heleios, Lonsdale, 2021

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

Ophiomyia heleios sp. nov.

Figs 348-350

Description.

Wing length 2.5 mm (♂). Female unknown. Length of ultimate section of vein M4 divided by penultimate section: 0.9. Eye height divided by gena height: 7.5. Facial carina long and narrow with small subspherical bulb at midpoint. Gena not strongly produced, forming slightly <90° angle. Clypeus narrow with posterior arms curved outwards. Ocellar triangle shiny black, longer than wide and tapering anteriorly.

Chaetotaxy: Orbital setulae reclinate. Male vibrissal fasciculus long, narrow, and slightly upcurved. Two ori; two ors. Mid tibia with one small posteromedial seta.

Colouration: Body, including halter dark brown, with gena paler, ocellar triangle black, notum (excluding postpronotum and notopleuron) with faint green reflection, and femora paler on basal 3/5 with mid and hind femora yellowish ventrally on basal 2/5. Calypter white with hairs dark brown.

Genitalia: (Figs 348-350 ) Surstylus narrow with few inner-marginal tubercle-like setae. Distal margin of hypandrium long and tapered. Metepiphallus very small and with one pair of spines. Halves of basiphallus very ill-defined apically, slightly fused at base and with left side shorter. Base of distiphallus strongly exceeding base of mesophallus, with short dorsal margin (curled inwards and with several very short inner spines) that is atrophied on left side; distoventral margin of distiphallus well-sclerotised medially, produced as apically converging ridges. Ejaculatory apodeme atrophied to base on one side, clear along margins and with well-developed medial rib.

Host.

Unknown.

Distribution.

USA: VA.

Etymology.

Gr. "of a marsh, dwelling in a marsh", referring to the collection locality of the type.

Type material.

Holotype: USA. VA: Fairfax Co., Great Falls Park, swamp trail, 38°59.4'N, 77°15.2'W, Malaise trap, trap #2, 8.ix-11.v.2006, D.R. Smith (1♂, USNM).

Comments.

Ophiomyia heleios can be differentiated from Nearctic congeners by a white calypter margin (although the hairs are still typically dark), a greenish notum, a short gena, a slightly atypical ejaculatory apodeme and an unusually atrophied distiphallus that has a thick distoventral sclerotisation medially.

Figures

Figures 346 - 350. Ophiomyia galiodes Lonsdale, sp. nov. 346 hypandrial complex, left lateral 347 external genitalia, ventral 348 - 350 O. heleios Lonsdale, sp. nov. 348 hypandrium, ventral 349 hypandrial complex (excluding hypandrium and proepiphallus), left lateral 350 phallus and proepiphallus, ventral.